A parked car suffered damage when a adobe wall collapsed on it after a strong earthquake shook Chilpancingo, Mexico, Friday morning, April 18, 2014. A powerful magnitude-7.2 earthquake shook central and southern Mexico but there were no early reports of major damage or casualties. (AP Photo/Alejandrino Gonzalez)

Acapulco, Mexico -- A powerful 7.2-magnitude earthquake shook central and southern Mexico on Friday, sending panicked people into the streets. Some walls cracked and fell, but there were no reports of major damage or casualties.

The U.S. Geological Survey said the quake at about 9:30 a.m. (10:30 a.m. EDT) was centered on a long-dormant fault line northwest of the Pacific resort of Acapulco, where many Mexicans are vacationing for the Easter holiday.

It was felt across at least a half-dozen states and Mexico's capital, where it collapsed several walls and left larges cracks in some facades. Debris covered sidewalks around the city.

Around the region, there were reports of isolated and minor damage, such as fallen fences, trees and broken windows. Chilpancingo, capital of the southern state of Guerrero, where the quake was centered, reported a power outage, but service was restored after 15 minutes.

In Acapulco, 59-year-old Enedina Ramirez Perez was having breakfast, enjoying the holiday with about 20 family members, when her hotel started to shake.

"People were turning over chairs in their desperation to get out, grabbing children, trampling people," the Mexico City woman said.

The quake struck 170 miles southwest of Mexico City, where people fled high-rises and took to the streets, many in still in their bathrobes and pajamas on their day off.

Mexico City Mayor Miguel Angel Mancera said there were small power outages from fallen transformers but officials were working to restore the service.

The USGS initially calculated the quake's magnitude at 7.5, but later downgraded it to 7.2. It said the quake was centered 22 miles northwest of the town of Tecpan de Galeana, and was 15 miles deep.

Mexico City itself is vulnerable even to distant earthquakes because much of it sits atop the muddy sediments of drained lake beds that quiver as quake waves hit.

Miriam Matz, 45, gathered her suitcases and her teenage daughter to temporarily move out the apartment in the Morelos housing towers in downtown Mexico City where she has lived for five years, after brickwork and concrete slabs fell off the side of the 15-story tower, and long snaking cracks appeared on some walls during Friday's earthquake.